The University of Oklahoma houses one of the leading academic libraries in the Southwest. The State of Oklahoma and private citizens have made strong commitments to strengthen the library resources and facilities, making the University Library System the largest in the state, with over two million volumes. The collection includes over 19,000 books in philosophy, and the University receives over 150 philosophical journals. Of particular interest is the Immanuel Kant collection, one of the largest in the region, with over 450 titles. The OU Libraries are also renowned for the History of Science Collection, which contains nearly 90,000 volumes documenting the evolution of scientific and technological thought, including many rare editions by the world's foremost scientists (such as first editions of Galileo, with notes in his own handwriting). Many bibliographic and other databases, as well as digitized books and journal articles, are available through the Library System’s web site or by visiting the Electronic Information Center in Bizzell Memorial Library on the University’s main campus.